code: def G(x):
      return 2 - pow(x - 5, 2.0)
  
file_path: dlib/tools/python/test/test_global_optimization.py
imports: from dlib import find_max_global, find_min_global
  import dlib
  from pytest import raises
  from math import sin, cos, pi, exp, sqrt, pow
label_desc: Use image node_id 3 for calling a global function with example usage: G(x) and returns: unknown